2023 |
Prayudha, B.; Siregar, V.; Ulumuddin, Y. I.; Prasetyo, L. B.; Agus, S. B.; Suyadi,; Suyarso,; Salatalohi, A.; Anggraini, K. Mangrove forest encroachment by Nypa frutican, Derris trifoliata, and Acanthus spp. in Segara Anakan Lagoon Journal Article In: IOP Conference Series: Earth and Environmental Science, vol. 1251, no. 1, 2023, ISSN: 17551315. Abstract | Links | BibTeX | Tags: forest encroachment, fragmentation, landscape metrics, Segara Anakan Lagoon @article{Prayudha2023a, Based on phytosociological methods and land cover change analysis, previous studies in Segara Anakan Lagoon (SAL) indicated the spreading of mangrove species living in the forest margin ecotone into the forest interior, encroaching the other mangrove communities. This current study aims to quantify the spreading pattern of those mangrove species, assess the effect of the spreading of those mangrove species to the other mangrove communities, and identify the location of the spreading pattern relative to the newly emerged islands. The spreading pattern can be demonstrated by analyzing landscape structures quantified by landscape metrics. It was done using multi-Temporal mangrove maps, representing the changes in mangrove communities over four periods with a decade interval. The landscape metrics used were the aggregation index, the size of community patches, and the distance between the patches. These metrics were extracted by using landscape metrics, an R package. The changes in the metrics over time were compared namely 1990, 2000, 2010, and 2020. The results showed that the small patches of the forest margin species became more aggregated into a larger patch, while the mangrove forests became more fragmented. This condition occurred most in the west part of SAL where the new islands emerged. |
Widyastuti, Salmah; Perwitasari-Farajallah, Dyah; Prasetyo, Lilik Budi; Iskandar, Entang The Javan Gibbon (Hylobates moloch) Habitat Changes and Fragmentation in the Dieng Mountains, Indonesia Journal Article In: Jurnal Manajemen Hutan Tropika, vol. 29, no. 2, pp. 150–160, 2023, ISSN: 20892063. Abstract | Links | BibTeX | Tags: connectivity, habitat monitoring, landscape metrics, LULC change, primate conservation @article{Widyastuti2023, The endangered javan gibbon (Hylobates moloch) has been threaten by massive habitat loss and fragmentation in Java. The survival of the second largest population which inhabited unprotected Dieng mountains faced greater risk to habitat conversion and fragmentation. The landscape-level habitat monitoring using spatiotemporal quantification is crucial as a baseline data for javan gibbon conservation. Here, the land-use and land-cover (LULC) change of the Javan gibbon habitat during 1994–2009–2021 and its fragmentation in the Dieng mountains were quantified. This study revealed there were no significant decline in the total of forest. However, its quality was degraded in the interior of forest block. The forest has more fragmented from large patches into smaller patches and increased forest edge. The higher fragmentation happened in the areas that traversed by road. Six suitable forest blocks were identified with varying level of connectivity. Protection and restoration both in the forest and in the interior forest is immediate need, especially in the main forest block. The extra effort is also crucial in the connected forest but traversed by road. The blocks which closely isolated by road could be potentially reconnected by artificial canopy bridge, while the other distantly isolated block might need habitat restoration for corridor. |
2023 |
Mangrove forest encroachment by Nypa frutican, Derris trifoliata, and Acanthus spp. in Segara Anakan Lagoon Journal Article In: IOP Conference Series: Earth and Environmental Science, vol. 1251, no. 1, 2023, ISSN: 17551315. |
The Javan Gibbon (Hylobates moloch) Habitat Changes and Fragmentation in the Dieng Mountains, Indonesia Journal Article In: Jurnal Manajemen Hutan Tropika, vol. 29, no. 2, pp. 150–160, 2023, ISSN: 20892063. |